scheduler/listen.c

   1 /*
   2  * "$Id: listen.c,v 1.3 2000/01/04 13:46:10 mike Exp $"
   3  *
   4  *   Server listening routines for the Common UNIX Printing System (CUPS)
   5  *   scheduler.
   6  *
   7  *   Copyright 1997-2000 by Easy Software Products, all rights reserved.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Easy Software Products and are protected by Federal
  11  *   copyright law.  Distribution and use rights are outlined in the file
  12  *   "LICENSE.txt" which should have been included with this file.  If this
  13  *   file is missing or damaged please contact Easy Software Products
  14  *   at:
  15  *
  16  *       Attn: CUPS Licensing Information
  17  *       Easy Software Products
  18  *       44141 Airport View Drive, Suite 204
  19  *       Hollywood, Maryland 20636-3111 USA
  20  *
  21  *       Voice: (301) 373-9603
  22  *       EMail: cups-info@cups.org
  23  *         WWW: http://www.cups.org
  24  *
  25  * Contents:
  26  *
  27  *   StartListening() - Create all listening sockets...
  28  *   StopListening()  - Close all listening sockets...
  29  */
  30
  31 /*
  32  * Include necessary headers...
  33  */
  34
  35 #include "cupsd.h"
  36
  37
  38 /*
  39  * 'StartListening()' - Create all listening sockets...
  40  */
  41
  42 void
  43 StartListening(void)
  44 {
  45   int           i,              /* Looping var */
  46                 val;            /* Parameter value */
  47   listener_t    *lis;           /* Current listening socket */
  48
  49
  50  /*
  51   * Setup socket listeners...
  52   */
  53
  54   for (i = NumListeners, lis = Listeners; i > 0; i --, lis ++)
  55   {
  56     LogMessage(LOG_DEBUG, "StartListening() address=%08x port=%d",
  57                ntohl(lis->address.sin_addr.s_addr),
  58                ntohs(lis->address.sin_port));
  59
  60     if ((lis->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
  61     {
  62       LogMessage(LOG_ERROR, "StartListening() Unable to open listen socket - %s.",
  63                  strerror(errno));
  64       exit(errno);
  65     }
  66
  67     fcntl(lis->fd, F_SETFD, fcntl(lis->fd, F_GETFD) | FD_CLOEXEC);
  68
  69    /*
  70     * Set things up to reuse the local address for this port.
  71     */
  72
  73     val = 1;
  74 #ifdef __sun
  75     setsockopt(lis->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
  76 #else
  77     setsockopt(lis->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
  78 #endif /* __sun */
  79
  80    /*
  81     * Bind to the port we found...
  82     */
  83
  84     if (bind(lis->fd, (struct sockaddr *)&(lis->address), sizeof(lis->address)) < 0)
  85     {
  86       LogMessage(LOG_ERROR, "StartListening() Unable to bind socket - %s.", strerror(errno));
  87       exit(errno);
  88     }
  89
  90    /*
  91     * Listen for new clients.
  92     */
  93
  94     if (listen(lis->fd, SOMAXCONN) < 0)
  95     {
  96       LogMessage(LOG_ERROR, "StartListening() Unable to listen for clients - %s.",
  97                  strerror(errno));
  98       exit(errno);
  99     }
 100
 101    /*
 102     * Setup the select() input mask to contain the listening socket we have.
 103     */
 104
 105     DEBUG_printf(("StartListening: Adding fd %d to InputSet...\n", lis->fd));
 106     FD_SET(lis->fd, &InputSet);
 107   }
 108
 109   LogMessage(LOG_DEBUG, "StartListening() NumListeners=%d", NumListeners);
 110 }
 111
 112
 113 /*
 114  * 'StopListening()' - Close all listening sockets...
 115  */
 116
 117 void
 118 StopListening(void)
 119 {
 120   int           i;              /* Looping var */
 121   listener_t    *lis;           /* Current listening socket */
 122
 123
 124   for (i = NumListeners, lis = Listeners; i > 0; i --, lis ++)
 125   {
 126 #if defined(WIN32) || defined(__EMX__)
 127     closesocket(lis->fd);
 128 #else
 129     close(lis->fd);
 130 #endif /* WIN32 || __EMX__ */
 131
 132     DEBUG_printf(("StopListening: Removing fd %d from InputSet...\n", lis->fd));
 133     FD_CLR(lis->fd, &InputSet);
 134   }
 135
 136   LogMessage(LOG_DEBUG, "StopListening()");
 137 }
 138
 139
 140 /*
 141  * End of "$Id: listen.c,v 1.3 2000/01/04 13:46:10 mike Exp $".
 142  */